Atomic StructurePARTS OF THE ATOM

WHAT DO THE NUMBERS MEAN?

Learning Targets:

I can arrange the atomic particles by size (DOK 1) I recognize the significance of the number of protons

in an atom and how that number relates to the identity of the atom (DOK 1)

I can relate the atomic number of an atom to the number of electrons in a neutral atom (DOK 2)

I can explain and interpret the numbers and symbols on the periodic table (DOK 1 and DOK 3)

Atomic Particles

Particle Charge Mass # Location

Electron -1 0 Electron Cloud

Proton +1 1 Nucleus

Neutron 0 1 Nucleus

What is an atom made up of? Atomic Particles:

Proton Identifier for the atom, keeps electrons attached to the

atomSlightly smaller than the neutron

NeutronStabilize the atom Slightly larger than the proton

ElectronAllowing for atoms to bond to other atomsSmallest of the 3 subatomic particles

What makes up the subatomic particles?

What is the smallest thing on earth?

Please click on the above link to watch the video.

What do the numbers and letters on the periodic table mean?

Atomic Number

Atomic Symbol

Element Name

Atomic Mass

Atomic Number

This is the number of protons in the nucleus, of an atom…. ALWAYS!

Think of it like an atom’s DNA It is what makes an element an element

It also tells you how many electrons are in a STABLE atom. Protons = electrons in stable atoms

ATOMIC NUMBER

Recognizing Atomic Numbers:Element Atomic Number

Lithium (Li)

Sulfur (S)

8

Carbon (C)

11

Atomic Number Practice:Element Atomic Number # of Protons # of Electrons

Nitrogen

17

10

8

6 6

Atomic Mass

Is the number of protons PLUS the number of neutrons in the nucleus of an atom.

Unit is Atomic Mass Units (AMU’s)

Atomic Mass

Atomic Mass:

Mass # = p+ + n0

*plug in what you know, and you can determine the mass, the number of neutrons, the number of protons, or the element.

Element # of protons # of neutrons # of electrons Mass #

Oxygen 8 8 8 16

Arsenic 33 42 33 75

Phosphorous 15 16 15 31

Complete this chart in your notes:

Element # of Protons # of Electrons

Atomic # Atomic Mass # of Neutrons

Carbon 6 6 6 12 6

Sulfur 16

Sodium 11

79

27 14

Helium (He) 4

20

Polonium (stable)

84

Lead 82

Check your work:

Element # of Protons # of Electrons

Atomic # Atomic Mass # of neutrons

Carbon 6 6 6 12 6

Sulfur 16 16 16 32 16

Sodium 11 11 11 23 12

Gold (Au) 79 79 79 197 118

Aluminum 13 13 13 27 14

Helium 2 2 2 4 2

Calcium 20 20 20 40 20

Polonium (Stable)

84 84 84 209 125

Lead 82 82 82 207 125